two-stage seal 双重嵌封
single-stage mechanical seal 单级机械密封
double-stage mechanical seal 双级机械密封
On the basis of research on the tooth -shape of single stage seal, a new type tooth - shape of multistage seal is suggested.
在对磁流体单级密封齿形研究基础上，提出了一种新型多级密封齿形结构。
Mr Seal added: "At a later stage we hope to be also be able to use this for domestic consumption to supply drinking water in our factories.
希尔先生补充道：“在随后的阶段，我们还期待这项技术能为我们的工厂员工提供饮用水，以最终应用于公司内部的消费，”
If you're lucky enough to make it to the interview stage, you'll need to be at your best to seal the deal.
如果你很幸运能够进入面试阶段，你需要做得最好以获得这份工作。
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